Kozaki, Masahiro
Current rating: 1479
Record: 18-19
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1490 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 366 | Watanabe, Daisuke (1534) | Won 2-0 | +191509 |
| 2sealed | 54 | Ishida, Ryuichiro (1728) | Lost 1-2 | -151494 |
| 3sealed | 633 | Kamiharai, Toshihito (1525) | Won 2-0 | +191513 |
| 4sealed | 671 | Zhang, Weiqin (1687) | Lost 1-2 | -151498 |
| 5sealed | 573 | Takahashi, Akira (1417) | Lost 1-2 | -191479 |
| top | average opponent: 1578record: 2-3 | new rating: 1479 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1567 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 507 | Asahara, Akira (1891) | Lost 1-2 | -121555 |
| 2standard | 759 | Tanabe, Koichiro (1352) | Lost 1-2 | -221533 |
| 3standard | 1004 | Imamura, Daisuke (1149) | Lost 1-2 | -251508 |
| 4standard | 1070 | Uehara, Masayuki (1481) | Lost 0-2 | -181490 |
| top | average opponent: 1468record: 0-4 | new rating: 1490 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1586 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 89 | Watanabe, Takafumi (1500) | Lost 0-2 | -191567 |
| top | record: 0-1 | new rating: 1567 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1612 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 438 | Shigeta, Takuya (1500) | Won 2-1 | +161628 |
| 2standard | 539 | Lee, Kun-Hsin (1481) | Won 2-1 | +151643 |
| 3standard | 608 | Takahashi, Nozomu (1748) | Lost 1-2 | -161627 |
| 4standard | 1019 | Wang, Zimo 5256 (1539) | Lost 0-2 | -191608 |
| 5standard | 992 | Tanaka, Yuuji (1498) | Lost 0-2 | -201588 |
| 6standard | 1161 | Ieda, Toma (1552) | Won 2-0 | +171605 |
| 7standard | 910 | Iwaide, Yoshitaka (1576) | Lost 0-2 | -191586 |
| top | average opponent: 1556record: 3-4 | new rating: 1586 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 188 | Seki, Kazuhiko (1608) | Won 2-0 | +201503 |
| 2sealed | 224 | Yoneya, Ryou (1518) | Won 2-0 | +181521 |
| 3sealed | 577 | Park, Heechan (1455) | Won 2-1 | +171538 |
| 4sealed | 55 | Ootake, Takeshi (1596) | Lost 0-2 | -171521 |
| 5sealed | 381 | Kametaka, Hiroaki (1540) | Won 2-1 | +181539 |
| 6sealed | 279 | Kondou, Masaki (1421) | Won 2-1 | +161555 |
| 7sealed | 137 | Nomura, Takeshi (1429) | Won 2-1 | +161571 |
| 8sealed | 46 | Deguchi, Koya (1609) | Lost 0-2 | -171554 |
| 9sealed | 106 | Marx, Christian (1404) | Won 2-0 | +151569 |
| 10draft | 31 | Wada, Yuusaku (1523) | Lost 0-2 | -191550 |
| 11draft | 291 | Cheng, Tung-Yi (1761) | Lost 0-2 | -141536 |
| 12draft | 310 | Sugimura, Yoshiyasu (1664) | Won 2-0 | +201556 |
| 13draft | 132 | Sung-Hun, Lee (1579) | Won 2-0 | +191575 |
| 14draft | 43 | Kubo, Hirotaka (1574) | Won 2-0 | +181593 |
| 15draft | 96 | Ishikami, Naotaka (1672) | Won 2-0 | +191612 |
| top | average opponent: 1557record: 11-4 | new rating: 1612 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 364 | Tsuruta, Tomoyuki (1482) | Lost 1-2 | -181482 |
| 2sealed | 322 | Sasaki, Hideto (1497) | Won 2-1 | +181500 |
| 3sealed | 280 | Sasaki, Yuuki (1497) | Won 2-1 | +181518 |
| 4sealed | 231 | Sugiyama, Takanori (1494) | Lost 1-2 | -191499 |
| 5sealed | 244 | Kobayashi, Akihiro (1558) | Lost 1-2 | -161483 |
| top | average opponent: 1505record: 2-3 | new rating: 1483 | ||